RELATIONSHIP OF REGIONAL ECOSYSTEMS PRODUCTIVITY WITH THE DYNAMICS OF HYDROTHERMAL CONDITIONS ON THE TERRITORY OFTHE CRIMEAN PENINSULA

Abstract

The results of assessing of the spatiotemporal relationship and interannual dynamics the of regional ecosystems productivity of the Crimean Peninsula with hydmthennal conditions аге presented. Landsat space images from 1979 to 2017 аге used as the research material. The resolution of each image is 30х30 m The NDVI index was used to account for the productivity factor of ecosystems in the study. The ArcGIS 10 image analysis module is used to determine this index On the basis of the rank correlation coefficient, several clearly defined intervals are determined, which, in tum, allow for the selected time period to identify several quite clearly defined periods in determining the influence ofhydrothennal states of regional ecosystems on the fonnation of the value of their biological productivity. For the period from 1979 to 2017, four periods characterized Ьу different degrees of spatiotemporal correlation between productivity of regional ecosystems and their heat and moisture supply are identified. The first period is characterized Ьу relatively staЫe and sufficiently high values of spatial correlation between values of regional ecosystems productivity and indicators of hydrothennal states. The second period is represented Ьу much less staЫe indicators and fluctuations of spatial relationship in dynamics from year to year. The third period is associated with stabihzation of spatial relationship indicators and their increase to the level of the fIГSt period, while the relationship of productivity with temperatures is more staЫe in time. The fourth period, is characterized Ьу violation of staЫe dynamics in considered indicators, their fluctuations towards decrease of spatial relationship degree with possiЫe sharp jumps in case of especially dry and hot seasonal states, which, in general, correlates rather tightly with the shift of seasonal states. These periods are quite clearly connected with the changes in the prevailing circulation processes. The role of different circulation groups in the interannual dynamics of the spatial-temporal relationship of the characteristics under consideration is shown. It is noted that from 1957 up to 1985, the increase in the duration of the northem circulation had aЬsolute dominance. The barrier in 1985 coincides quite clearly with the change of the lst period of the present analysis. This clearly provided stabihty of the spatial relationship indicators in the lst period and some divergence in the 2nd period after the circulation type change. The 2nd period of the meridional Southem circulation epoch coincides with the lst period of staЫe relationship between heat and moisture availabihty indicators and values of productivity of regional ecosystems. The period from 1970 to 1997 was characterized Ьу southem cyclones exiting from the sea, which led to а decrease in air temperature in the Crimea on average per year, and to unstaЫe correlations with the productivity of ecosystems. From 1998 to the present, with the dominance of the meridional Northem circulation and the minimum duration of the Zonal circulation, there is а decrease in the duration of the meridional Southem circulation, which causes а sufficiently long period of staЫe relationships between productivity and the main climatic indicators in the 3rd period of this analysis. Decrease in mean annual temperature in 1981-1997 and its sharp increase in 1998-2013 clearly enough influence on the change of hnks with these parameters in pmductivity of regional ecosystems. The increase in air temperature in the period 1998-2013 is associated with the growth of the anticyclonic regime.